Fast, reliable diagnostic tool for 6–24V DC vehicle electrical systems. Use this automotive circuit tester to find bad grounds, confirm continuity, and verify voltage polarity quickly and safely. Key benefits Pinpoints poor ground connections and wiring faults so you can diagnose electrical problems faster and reduce repeat repairs. Built-in short circuit protection and 6–24V DC testing focus on vehicle DC systems and avoid risks associated with AC voltage. Long test lead (about 16 feet) lets you reach hard-to-access components without stretching or moving the battery. Simple operation: connect the unit to the vehicle battery and toggle the power button to instantly check positive and negative currents and polarity. What it does Identify and troubleshoot poor ground connections Verify continuity across wires, fuses, switches, and connectors Test voltage polarity to confirm correct wiring and prevent equipment damage Compatibility and performance Designed for 6–24V DC automotive electrical systems — suitable for most cars, trucks, and other 6–24V vehicle applications Rapid detection and clear polarity indication for efficient diagnostics Long lead improves accessibility when probing wiring harnesses, lights, sensors, and accessories How to use Connect the tester to the vehicle battery Position the probe on the circuit or component to test Toggle the power button to view polarity and continuity results immediately Practical use scenarios Verify taillight or turn-signal grounds and wiring when lights are dim or flicker Trace intermittent stereo, power-window, or accessory failures by checking continuity and polarity along the harness Confirm fuse and connector integrity when diagnosing starting or charging system issues Why choose this tester Focused DC testing range and short circuit protection deliver safer, vehicle-specific diagnostics Long cable and straightforward battery connection simplify tests on common automotive circuits Clear functionality for technicians and DIYers who need a practical, dependable circuit tester Specifications (as provided) Testing range: 6–24V DC Safety: built-in short circuit protection Lead length: approximately 16 feet Operation: connect to vehicle battery; toggle power button to check positive/negative currents and polarity